"Christina Aguilera, Adam Levine, Blake Shelton and Pharrell Williams Talk THE VOICE". Interview with Christina Radish, collider.com. February 24, 2015.
"Christina Aguilera, Adam Levine, Blake Shelton and Pharrell Williams Talk The Voice". Interview with Christina Radish, collider.com. February 24, 2015.
"Christina Aguilera, Adam Levine, Blake Shelton and Pharrell Williams Talk The Voice". Interview with Christina Radish, collider.com. Februart 24, 2015.